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openHAB: timestamp from last Item update

If openHAB has a Persistence service configured, the time of the last Item update (and a couple other times) is available in Rules. This makes it quite handy to check if a certain item hasn't been updated in a long time. As example I have the Tankerkoenig Binding installed, and this data is persisted in InfluxDB. This way I can see historic gas prices in Grafana.

When the Telegram Bot answers the "/tanken" question, it appends the timestamp of the last gas prices update.

 

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